The updated stretch sysroot doesn't work anymore with gyp.

Bug: chromium:788679
Change-Id: I26e196f29eeda3914399655a156b39ba26c9e988
Reviewed-on: https://chromium-review.googlesource.com/789940Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49636}